Abstract A new design for expanding the absorption band of absorber in near-infrared range is theoretically proposed. This design is achieved by a layered cascade metamaterial structure that consists of four metamaterial slabs. A single metamaterial slab is made of a periodic array of tilted metal layers. The results show that the layered cascade structures obviously broaden the widths of the absorption bands. The transfer matrix is derived according to the special properties of the structure designed in the paper, and the absorption of the design is numerically simulated using the transfer matrix method. The influence of structural parameters on the absorption properties of metamaterial layer is analyzed: the locations of the absorption peaks are red-shifted with the increase of the inclination angles of the metal layers and the distance between the metal layers. The positions of the absorption peaks are blue-shifted with the increase of the thicknesses of the metal layers. The widths of the absorption bands increase while the centers of absorption peaks remain the same with the increase of the thicknesses of the metamaterial slabs. According to the above results, the metamaterial slabs which contain similar structural parameters are selected to constitute a layered cascade structure. The absorption of the layered cascade structures is numerically simulated and theoretically analyzed. The simulation results show that the absorption bands are obviously widened and the multi-band absorption peaks are found in the near-infrared region with the superposition of different suitable materials.

中文翻译：

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基于超材料的近红外宽带完美吸收

摘要 从理论上提出了一种扩展吸收体在近红外范围内的吸收带的新设计。这种设计是通过由四个超材料板组成的分层级联超材料结构实现的。单个超材料板由倾斜金属层的周期性阵列制成。结果表明，层状级联结构明显拓宽了吸收带的宽度。根据论文中设计的结构的特殊性质推导出传递矩阵，利用传递矩阵法对设计的吸收进行数值模拟。分析结构参数对超材料层吸收性能的影响：吸收峰的位置随着金属层倾角和金属层间距离的增加而发生红移。随着金属层厚度的增加，吸收峰的位置发生蓝移。随着超材料板厚度的增加，吸收带的宽度增加，而吸收峰的中心保持不变。根据上述结果，选取结构参数相似的超材料板构成层状级联结构。对层状级联结构的吸收进行了数值模拟和理论分析。